------------------------------
11:33:12 (ERROR): | .. |        910250866098,  013-072-445 97   6609000043   .
 : System.ArgumentException
 :    !
System.ArgumentException:    !

Server stack trace: 
   at SKBKontur.KZ.FSS.ELN.Signer.SignRequest(XmlDocument doc, FSSServiceOptions options)
   at SKBKontur.KZ.FSS.ELN.EncMessageInspector.BeforeSendRequest(Message& request, IClientChannel channel)
   at System.ServiceModel.Dispatcher.ImmutableClientRuntime.BeforeSendRequest(ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.PrepareCall(ProxyOperationRuntime operation, Boolean oneway, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at SKBKontur.KZ.FSS.ELN.WSInsurerCryptoV20.FileOperationsLnService.GetPrivateLNData(getPrivateLNDataRequest1 request)
   at SKBKontur.KZ.FSS.ELN.WSInsurerCryptoV20.FileOperationsLnServiceClient.SKBKontur.KZ.FSS.ELN.WSInsurerCryptoV20.FileOperationsLnService.GetPrivateLNData(getPrivateLNDataRequest1 request)
   at SKBKontur.KZ.FSS.ELN.Helpers.GetRequestElnV20(String lnCode, String snils, FSSServiceOptions options)
   at SKBKontur.KZ.FSS.ELN.Helpers.GetRequestELN(String lnCode, String snils, FSSServiceOptions options) 
